Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7a7620a3ae4cd4…

MALICIOUS

PDF

74.6 KB Created: 2021-09-17 19:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 780b446e64cc492cf74937ed16d5a2b6 SHA-1: 15d718e42970b9735bea85a025fd5e5d1bae70dd SHA-256: 7d7a7620a3ae4cd4225b441fd65341556b4fdbf89fd3eebeafde7d8113a5ba94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure strongly suggest an attempt to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=rebel+racing+hack+ios PDF link annotation
    • http://shinex-auto.com/userfiles/file/bukazagoxobunev.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/gatirikenonaxexotetiti.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/joloxajuxiw.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/61508423133.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/zewubegumojesukat.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/52072759814.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613427012bda5---1601796908.pdfIn PDF document text
    • http://ministerium.pt/files/bivetujubowevimimojofib.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/ridudiludiz.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/vejipupudaroxafoxuxokon.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/35718652163.pdfIn PDF document text
    • https://aokman-drive.com/d/files/66303673916.pdfIn PDF document text
    • https://sergiomauri.com/images/file/25580738854.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/wonobekuroron.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/tewomixukawukizolimob.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/fowinedupazubudawul.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/tefobalabowasizasasak.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/gakurijinujepesusaxe.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/39df6293ef18559f777abdf016aa66a4/pikizilokomekeg.pdfIn PDF document text
    • http://robedecreateur.com/img/files/15975175772.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/23260515455.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/rafifolorunigizevin.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/zubabotodabozivada.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/13429178754.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/39340585199.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC033 16976 bytes
SHA-256: 8971caa593fd75515ef39279581882576c28af1dfe74dc18541c708123eed9df
font_01_sfnt_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 10688 bytes
SHA-256: a9cd54cf267918c981b6d8d5b96ca30d8c709e67a17a72ca809ef6edd2e2ca6d